I'm sure you all will think I just fell off the cabbage truck, but honestly I don't know what to do with the vent line on the fuel tank I'm using for a Quadra 42 set up in a Giant Stinger. This is my first experience with a gas engine. I'll take the ribbing in good humor if someone will take pity on me and tell me the secret.

Just vent it to the outside of the plane..I just drill a hole in the bottom of the fuse and route it to the outside..

Some poeple like to get fancy and add a filter to the line, loop back over the tank prior to exit, and a bunch of other stuff, but Josey gave the easiest and most effective way. Hole in the bottom and exit the line at a length that suits you.

Thanks guys.....sounds easy enough........guess I'll loop up and over the tank just to humor myself about losing fuel in an unusual attitude.
Rsexton

The information you have already received is correct. I do mine the same way as Josey suggested. But....., When I'm done flying for the day, I always put a "fuel dot," on the vent (over flow) line, to keep fuel from dripping out while transporting the plane.

Caution: Don't forget to remove the fuel dot on the vent before fueling, and flying the aircraft.

I like to loop it on top of the tank all the way to the back end of the tank and then out the front, bottom of the cowl. This way, even with a full tank, I can tip the plane forward on its nose and no fuel will run out the overflow line.

See post # 16 in this thread for a good way inatall a check valve in the vent line and not have fuel drip out.

http://www.rcuniverse.com/forum/m_23...tm.htm#2386947

Ken

I just hang it out in the breeze and let it flop.

Seems to do OK? Never any siphoning or anything.

Enjoy,

Jim

heres a pic hope it helps.

I agree mostly with every post. I use a check valve on mine and also have a plug for when I am not flying. Just do not forget to take out when flying or you will starve the engine of fuel and kill it.

I don't use a check valve, but I do use a filter. I also run the vent line to the top back of the tank then out the bottom front to create an "anti-siphon loop". Works well.

Also, I don't plug the vent line, especially if taking the plane from the 40 degree field into the 70 degree house... creates pressure in the tank and on the carb. Using the loop, I store the plane in the basment without any fume problems whatsoever.

That is a great idea...tried it and it works.

If you use a check valve - find one with the lowest unseating pressure
Some carbs are persnickety about the "fuel head" they see. any resistance to flow in the tank is seen as a larger vertical draw distance.
Old control line flyers remember and use - a vent line, mounted and facing into the airstream- to prevent a negative pressure in the tank.